d2chaos: respect sequence diagrams

[nhooyr]

https://github.com/terrastruct/d2/actions/runs/3627398645/jobs/6117297838

test: --- FAIL: TestD2Chaos (0.00s)
test:     d2chaos_test.go:49: writing generated files to out
test:     --- FAIL: TestD2Chaos/#00 (0.02s)
test:         d2chaos_test.go:82: failed to create "\"G\\n\x1c=f\x02>f)6\x17\x0ffk'np4\x18+W^-\x02>MC\x10\x1ew\" -> \"G\\n\x1c=f\x02>f)6\x17\x0ffk'np4\x18+W^-\x02>MC\x10\x1ew\".\"tk[TOmI(X\x05bv6K(6\x06 d@\"": failed to recompile:
test:             "G\n�=f�>f)6��fk'np4�+W^-�>MC��w": {
test:               shape: sequence_diagram
test:               "tk[TOmI(X�bv6K(6� d@": {shape: page}
test:             }
test:             "G\n�=f�>f)6��fk'np4�+W^-�>MC��w" -> "G\n�=f�>f)6��fk'np4�+W^-�>MC��w"."tk[TOmI(X�bv6K(6� d@"
test:             
test:             5:1: connections within sequence diagrams can connect only to other objects within the same sequence diagram

cc @gavin-ts @ejulio-ts

[ejulio-ts]

Another example (shape: image)

D2_CHAOS_MAXI=100 go test ./d2chaos -run $TestD2Chaos^                                                                              1 ↵  ✹ ✭gh-376-d2chaos 
--- FAIL: TestD2Chaos (0.00s)
    d2chaos_test.go:49: writing generated files to out
    --- FAIL: TestD2Chaos/#00 (0.01s)
        d2chaos_test.go:82: failed to set "\"\tFrX,f/G\x16\u007fD\r\".shape" to "\"image\"": failed to recompile:
            "Y0
               Z/oGgg+|N\ntekv": {
             pO	h4r5Ii07qtTrkpn: {shape: rectangle}
             pO	h4r5Ii07qtTrkpn ->pO	h4r5Ii07qtTrkpn
            }
            "Y0
               Z/oGgg+|N\ntekv" <-> "Y0
                                       Z/oGgg+|N\ntekv": '""'
            "Y0
               Z/oGgg+|N\ntekv" <- "Y0
                                      Z/oGgg+|N\ntekv"
            "Y0
               Z/oGgg+|N\ntekv" -> "Y0
                                      Z/oGgg+|N\ntekv"
            "Y0
               Z/oGgg+|N\ntekv" -> "Y0
                                      Z/oGgg+|N\ntekv"
            "Y0
               Z/oGgg+|N\ntekv" -> "Y0
                                      Z/oGgg+|N\ntekv"
            "Y0
               Z/oGgg+|N\ntekv" <- "Y0
                                      Z/oGgg+|N\ntekv"pO	h4r5Ii07qtTrkpn: '"68	~C|NaIz|>&:|h:jE0T.SfH�OL.<\$W&bmeZa?!?M7m0k#~<W5y2\nIIi=o^:ib0#Uhd)4c[Sw\nxF^4P%7t,[rdLT gY#gK;"'
            "Y0
               Z/oGgg+|N\ntekv" <-> "Y0
                                       Z/oGgg+|N\ntekv": '"\nC	NsCF6BlaIB4Riy,v
                                                                                JfO6h@>!9
                                                                                         bMZd?\$Fji0\$G>otsZC\$esS#"'
            "Y0
               Z/oGgg+|N\ntekv" -> "Y0
                                      Z/oGgg+|N\ntekv"
            "Y0
               Z/oGgg+|N\ntekv"pO	h4r5Ii07qtTrkpn -- "Y0
                                                              Z/oGgg+|N\ntekv"
            "Y0
               Z/oGgg+|N\ntekv"pO	h4r5Ii07qtTrkpn <- "Y0
                                                              Z/oGgg+|N\ntekv"
            t Mr\$LDo
                     O42l9d: {shape: sequence_diagram}
            "Y0
               Z/oGgg+|N\ntekv" -> t Mr\$LDo
Bbiy'' Ua)6,"'                              O42l9d: '"K
            t Mr\$LDo
                     O42l9d <- "Y0
                                  Z/oGgg+|N\ntekv"
": {shape: image}rX,f/GD
            
            18:18: image shape must include an "icon" field
            
FAIL
FAIL	oss.terrastruct.com/d2/d2chaos	0.233s
FAIL